Basic
I/O
System (BIOS) Functions
CHECK
FOR
CONSOLE
CHARACTER
READY
ENTRY
FUNCTION
2
CONST
RETURN
AL: Return Code
This function reads the status
of
the currently assigned console device
and
returns
OFFH in register AL if a character
is
ready to be read, and
OOH
in register AL if no
console character
is
ready.
READ CONSOLE
CHARACTER
IN
ENTRY
FUNCTION
3
CONIN
RETURN
AL: Character
This function reads the next console character into register AL.
If
no console
character
is
ready, the function waits until a character
is
typed before returning.
WRITE
CONSOLE
CHARACTER
OUT
ENTRY
CL: ASCII
Character
FUNCTION
4
CONOUT
RETURN
This function sends the ASCII character in register
CL
to the console
output
device.
WRITE LISTING
CHARACTER
OUT
ENTRY
CL: ASCII
Character
FUNCTION
5
LIST
RETURN
This function sends the ASCII character in register
CL
to the currently assigned list
device.
5-7
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